ICO Generator
Create favicon ICO files from images
Last updated:ICO generation builds a Windows favicon file containing your image resampled at 16×16, 32×32, and 48×48 pixels — the standard set browsers and Windows look for. LlamaPDF resamples each size via canvas and writes the ICO container in your browser. Custom size lists are also supported.
Drag & drop your file here
or click to choose
Max 50 MB · No registration needed
Your file stays on your device — never uploaded
How to create an ICO favicon
- 1
Upload the image you want to use as your favicon — a square PNG or JPG works best. Logos, brand marks, and simple icons produce the clearest results at small sizes.
- 2
Select the sizes you need. Standard favicon sizes include 16x16, 32x32, and 48x48 pixels. You can generate a multi-size ICO that bundles several dimensions into one file for maximum browser compatibility.
- 3
Click Generate and download your ICO file. The conversion runs entirely in your browser — your brand assets stay on your device and are never uploaded anywhere.
Why use our ICO generator?
Every website needs a favicon — it's the small icon that appears in browser tabs, bookmarks, and history lists. Without one, your site looks unfinished and unprofessional. Creating a proper ICO file with the right sizes bundled together is surprisingly tricky using standard image editors, which is why developers often waste time searching for conversion tools. Our ICO generator handles the entire process in one step: upload your logo, pick your sizes, and get a ready-to-deploy favicon file.
No account needed and no software to install — it works directly in your browser on any device. Starting from a vector logo? Use our SVG to PNG converter to rasterize it first, then generate your ICO from that. Our image compressor and image resizer can help optimize the rest of your site's images.
What is an ICO file?
ICO is a file format created by Microsoft specifically for icons in the Windows operating system, but it's best known today as the format for website favicons. What makes ICO unique is its ability to contain multiple images at different sizes and color depths within a single file — for example, 16x16, 32x32, and 48x48 pixel versions of the same icon. Browsers automatically select the most appropriate size depending on where the icon is displayed (tab bar, bookmark, desktop shortcut). While modern browsers also support PNG and SVG favicons, ICO remains the most universally compatible option across all browsers, including older versions of Internet Explorer.